The Effect of a Uniform Cross-flow on the Circulation of Vortex Rings

Hassan, E. R., Kelso, R. M. and Lanspeary, P. V. (2007). The Effect of a Uniform Cross-flow on the Circulation of Vortex Rings. In: Peter Jacobs, Tim McIntyre, Matthew Cleary, David Buttsworth, David Mee, Rose Clements, Richard Morgan and Charles Lemckert, 16th Australasian Fluid Mechanics Conference (AFMC). 16th Australasian Fluid Mechanics Conference (AFMC), Gold Coast, Queensland, Australia, (146-150). 3-7 December, 2007.

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Author Hassan, E. R.
Kelso, R. M.
Lanspeary, P. V.
Title of paper The Effect of a Uniform Cross-flow on the Circulation of Vortex Rings
Conference name 16th Australasian Fluid Mechanics Conference (AFMC)
Conference location Gold Coast, Queensland, Australia
Conference dates 3-7 December, 2007
Proceedings title 16th Australasian Fluid Mechanics Conference (AFMC)
Place of Publication Brisbane, Australia
Publisher School of Engineering, The University of Queensland
Publication Year 2007
Year available 2007
Sub-type Fully published paper
ISBN 978-1-864998-94-8
Editor Peter Jacobs
Tim McIntyre
Matthew Cleary
David Buttsworth
David Mee
Rose Clements
Richard Morgan
Charles Lemckert
Start page 146
End page 150
Total pages 5
Collection year 2007
Language eng
Abstract/Summary This paper describes observations and measurements of the effects of a uniform cross flow on the vorticity field and circulation of a laminar vortex ring ejected from an elevated pipe. From particle-image velocimetry (PIV) in the plane defined by the axis of the vortex ring and the direction of the cross flow, we observe the growth and decay of the vortex-ring and its interaction with the shear layer which is produced by the cross flow over the surface of the elevated pipe. As the vortex ring is generated it passes through and disrupts this shear layer. Some rotational fluid from the shear layer is carried with the vortex ring as it moves away from the elevated pipe. From the PIV data, we calculate a positive-core circulation on the upstream side of the vortex ring and a negative circulation on the other side. The growth rate of positive-core circulation is reduced by cancellation with the cross-flow shear-layer vorticity which is of opposite sign. The initial negative circulation is equal to the circulation of the cross-flow shear layer, but the cross flow and the cross-flow shear layer have no effect of the growth rate of the negative circulation.
Subjects 290501 Mechanical Engineering
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

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Created: Tue, 18 Dec 2007, 14:36:11 EST by Laura McTaggart on behalf of School of Engineering